On Fri, Jun 10, 2016 at 03:32:41PM +0800, Chunfeng Yun wrote: > --- /dev/null > +++ b/drivers/usb/mtu3/Makefile > @@ -0,0 +1,20 @@ > + > +#ifeq ($(CONFIG_USB_DEBUG),y) > + ccflags-y += -DDEBUG > +#endif There is no CONFIG_USB_DEBUG in the tree anymore, are you sure you tested this? :) thanks, greg k-h